<template>
    <p>父组件当前的值为：{{number}}</p>
    <CustomSubComponent @updateCount="updateEmitCount"/>
</template>
<script setup>
import CustomSubComponent from './CustomSubComponent.vue';
import { ref } from 'vue';
const number = ref(10);
const updateEmitCount = (value) => {
    number.value += value;
};
</script>